Inheritence
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Inheritence

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    Inheritence Inheritence Presentation Transcript

    • Inheritance Chapter 7
    • Inheritance: the way genes are passed down.
      • If a father doesn’t have a leg does that mean his children will be born with out a leg????
    • Hundreds of years ago people knew that somehow certain traits would be passed on to their children .
    • Gregor Mendel was the first to predict the outcome of inheritance. The study of inheritance is Genetics .
      • Mendel did several different experiments on pea plant.
      • This is an example of wrinkled and smooth seeds.
    • Genes and Alleles
      • A gene is a specific piece of DNA.
      • You have two genes that code for the same thing (ex. Height). Each of those two genes is called an allele.
      • So if something had the genes Aa one allele would be “A” the other would be “a”).
    • Why two alleles for every gene?
      • Because organisms get 2 sets of chromosomes ……….one from the mother and one from the father.
    • Phenotype
      • Is the physical characteristics of the trait.
      • In most cases it is what we can “see”.
      • Example: Freckles, dimples, attached earlobes etc.
    • Genotype
      • Is the actual alleles that make up the trait.
      • In most all cases this is represented by 2 letters.
      • Example: AA, Aa, aa
    • Dominant
        • A dominant trait is a trait that covers or hides the other trait of an allele.
      • For example, dark colors in hair usually overshadow the other allele.
      • In this class Dominant will always be represented with a capital letter.
      • Example: Say “D” is the allele for black hair and “d” is the allele for blond. The if an animal had Dd then it would have black hair.
    • Recessive
      • A recessive trait is the trait that is hidden by the dominant trait.
      • In an animal with Dd for hair color the recessive allele is “d”.
      • The animal carries a gene for blond hair but you can’t tell by looking at it.
    • The End